ts-models-ARCH1: Simulation of an ARCH(1) time series.
Description
Returns a simulated time series \((Y_t)\) that fulfills the following equation:
$$Y_t = Z_t \sigma_t, \quad \sigma_t^2 = a_0 + a_1 Y_{t-1}^2 + \epsilon_t$$
where \(a_0\) and \(a_1\) are parameters and \(\epsilon_t\) is
independent white noise with marginal distribution specified by the
parameter innov.
Usage
ARCH1(n, a0, a1, overhead = 500, innov = rnorm)
Value
Return an ARCH(1) time series with specified parameters.
Arguments
n
length of the time series to be returned
a0
parameter
a1
parameter
overhead
an integer specifying the ``warmup'' period to reach an
approximate stationary start for the times series
innov
a function with one parameter n that yields n
independent pseudo random numbers each time it is called.